JP7313249B2 - Tubular knitted fabric product - Google Patents

Description

The present invention relates to tubular knitted fabric products.

Tubular knitted fabrics using elastic yarns are used for leg products such as pantyhose, leggings, and supporters that cover from the crotch to the ankles or toes, products that cover from under the shoulder to the wrists or fingertips such as arm covers, and products that cover joints such as supporters. Conventionally, as the above-mentioned products that provide a cooling sensation, leg products that use synthetic fibers with hygroscopicity such as polyamide fibers to suppress the feeling of stuffiness, leg products that use polyamide fibers with special cross-section yarns to obtain a cool feeling (see, for example, Patent Document 1 below), and leg products that also provide a cool contact feeling by using full-dull yarn (see, for example, Patent Document 2 below) are commercially available. These clothing products feel cool only at the moment of wearing in a slightly hot season such as early summer, but when worn for a long time or in a hot environment where exercise such as walking causes sweating, it is extremely uncomfortable due to sweating, and there is a problem that it is not suitable for hot environments such as midsummer.

JP-A-6-81207 Japanese Patent Application Laid-Open No. 2003-293201

In view of the problems of the conventional tubular knitted fabric products described above, the problem to be solved by the present invention is to provide a tubular knitted fabric product that makes it easy to feel cool when worn in a hot environment such as midsummer, by promoting air convection to increase heat dissipation compared to when it is not worn.

As a result of intensive studies and repeated experiments to solve the above problems, the inventors of the present invention discovered that by forming a specific knitted fabric structure at a specific position of the tubular knitted fabric product, air convection is promoted and heat dissipation is performed more efficiently than when the product is not worn, thereby making it possible to feel cooler. Based on this discovery, the present invention was completed.

That is, the present invention is as follows.
[1] A tubular knitted fabric product containing composite yarns made of elastic yarns and inelastic yarns, wherein the following formula:
Pitch rib height ratio = p/k
{In the formula, p = fiber spacing when assumed to be worn and stretched, k = fiber height when assumed to be worn and stretched}
The tubular knitted fabric product, wherein the pitch rib height ratio obtained in is 6.0 to 15.0.
[2] At the position of 13% of the total length from the center side of the body when wearing the product, the following formula:
Composite yarn elongation index = k/f
{In the formula, k = fiber height when stretched assuming wear, f = fineness of composite yarn}
The tubular knitted fabric product according to the above [1], wherein the composite yarn elongation index obtained in the above [1] is 4.0 or less.
[3] The tubular knitted fabric product according to the above [1] or [2], which has an exothermic temperature during elongation of more than 0°C and 0.5°C or less.
[4] The tubular knitted fabric product according to any one of [1] to [3], which is a leg product.
[5] The tubular knitted fabric product according to any one of [1] to [3], which is a garment covering at least part of the arm.

The tubular knitted fabric product of the present invention has higher heat dissipation than when it is not worn due to promotion of air convection, so that it is easy to feel cool when worn in a hot midsummer environment.

FIG. 4 is an explanatory diagram of portions for measuring the pitch rib height ratio, the composite yarn elongation index, the heat retention rate, the number of courses, and the number of wales of the leg product of the present embodiment. FIG. 4 is an explanatory diagram of portions for measuring the pitch rib height ratio, the composite yarn elongation index, the heat retention rate, the number of courses, and the number of wales of the leg product of the present embodiment. FIG. 4 is an explanatory diagram of portions for measuring the pitch rib height ratio, the composite yarn elongation index, the heat retention rate, the number of courses, and the number of wales of the leg product of the present embodiment. FIG. 4 is an explanatory diagram of a portion for measuring the pitch rib height ratio, the composite yarn elongation index, the heat retention rate, the number of courses, and the number of wales of a garment that covers at least part of the arm of the embodiment. FIG. 4 is an explanatory diagram of a portion for measuring the pitch rib height ratio, the composite yarn elongation index, the heat retention rate, the number of courses, and the number of wales of a garment that covers at least part of the arm of the embodiment.

Hereinafter, embodiments of the present invention will be described in detail.
The tubular knitted fabric product of this embodiment is a tubular knitted fabric product containing composite yarns made of elastic yarns and inelastic yarns, and the following formula:
Pitch rib height ratio = p/k
{In the formula, p = fiber spacing when assumed to be worn and stretched, k = fiber height when assumed to be worn and stretched}
The pitch rib height ratio obtained by is 6.0 to 15.0.

The tubular knitted fabric product of the present embodiment is a tubular knitted fabric product containing composite yarns composed of elastic yarns and inelastic yarns, and can be manufactured using a small-diameter single circular knitting machine (also referred to as a pantyhose knitting machine) with a hook diameter of about 4 to 5 inches.
The tubular knitted fabric product of this embodiment has the following formula at a position 13% of the total length from the center side of the body when the product is worn:
Pitch rib height ratio = p/k
{In the formula, p = fiber spacing when assumed to be worn and stretched, k = fiber height when assumed to be worn and stretched}
The pitch rib height ratio obtained by is 6.0 to 15.0. Here, "the central side of the body when the product is worn" refers to the side close to the connecting portion with the trunk. For example, in the case of a tubular knitted fabric product worn on the upper leg, if the product has a length up to the armpit, it is the armpit. In the case of a tubular knitted fabric product worn on the lower leg, when the product covers the crotch part, it is the crotch part. Further, "at the time of stretching assumed to be worn" means a state in which the tubular knitted fabric product is stretched corresponding to the time at which the tubular knitted fabric product is worn, and the details will be described in Examples.

In tubular knitted fabric products, it is important to increase the amount of heat dissipation (heat transfer from the skin and fibers to the outside environment) in order to obtain a sustained cool sensation. The amount of heat transferred from the skin to the environment depends not only on the surface area of the heat transfer surface and the thermal conductivity of the heat-conducting material, but also on the temperature difference between the skin surface and the environment. When a person stands upright without wearing a tubular knitted fabric product, that is, when there are no protrusions (ribs) on the skin surface, outside air warmed by the surface of the skin generates rising air currents near the surfaces of the legs and arms. Since the outside air rises along the surface of the skin while increasing the temperature little by little, warm air exists on the surface of the skin. On the other hand, when the tubular knitted fabric product of the present embodiment is worn and the wearer stands upright, the updraft rises along the irregularities of the clothing product near the surfaces of the legs and arms while undulating. In the cylindrical knitted fabric product, if the pitch rib height ratio is 6.0 to 15.0 at the position of 13% of the total length from the center side of the body when the product is worn, the convection of the outside air occurs efficiently, cold outside air is guided to the skin surface, the temperature gradient between the skin surface and the outside environment becomes steep, and heat dissipation from the skin surface is promoted. When the pitch rib height ratio is less than 6.0, the air stays between the ribs in a swirling manner, resulting in a product that feels hot and humid. In addition, the durability is poor, and problems such as holes being formed during wearing and running wires tend to occur.

In order to increase the amount of heat radiation, it is important to radiate heat from a wide area, so it is effective to increase the heat radiation from the human body part having a larger circumference and a larger surface area. A human body part having a large circumference and a large surface area corresponds to the upper arm part of the arm and the thigh part of the leg. Since the position of 13% of the total length from the center side of the body when the tubular knitted fabric product is worn corresponds to the thigh part of the leg product and the upper arm part of the arm cover, making this position the knitted fabric structure is extremely effective for increasing the amount of heat dissipation.

The amount of heat dissipation (heat transfer from the skin and fibers to the external environment) is greater when the composite yarn made up of elastic yarns and inelastic yarns is in close contact with the skin without including an air layer.
From the center side of the body when wearing the product, at the position of 13% of the total length, the following formula:
Composite yarn elongation index = k/f
The composite yarn elongation index obtained by {wherein, k = fiber height when stretched assuming wear, f = fineness of composite yarn} indicates the degree of elongation of the composite yarn when assuming wear is stretched. When the composite yarn elongation index is 4.0 or less, the composite yarn is well elongated when worn, resulting in a tubular knitted fabric product with higher adhesion to the skin, and the efficiency of heat dissipation is enhanced.

The heat dissipation property was evaluated by the heat retention rate described below. The heat retention rate is the following formula when measuring the amount of heat dissipation using a heat dissipation evaluation machine:
Heat retention rate = (W ₀ - W) / W ₀ × 100 (%)
{Wherein, W ₀ is the power consumption when the tubular knitted fabric is not attached to the evaluation device at standard temperature and humidity, and W is the power consumption when the tubular knitted fabric is attached to the evaluation device at standard temperature and humidity. }. The clothing product using the tubular knitted fabric of this embodiment has a heat retention rate of less than 0 when it is assumed to be worn and stretched. The smaller the heat retention rate, the higher the heat dissipation. In particular, when the heat retention rate is less than 0, it means that the heat dissipation is higher than when it is not worn. The details of the heat dissipation evaluation machine will be described in Examples.

The fineness of the yarn constituting the tubular knitted fabric product of the present embodiment can be arbitrarily selected from the viewpoint of pressure, consumption performance, texture feel, etc. However, from the viewpoint of easy adjustment of the pitch rib height ratio and the composite yarn elongation index within a suitable range, 13 to 56 dtex is preferable, 13 to 40 dtex is more preferable, and 13 to 31 dtex is even more preferable. The fineness of a composite yarn is the fineness in a state in which an elastic yarn is covered with a non-elastic yarn or in a state in which an elastic yarn and a non-elastic yarn are twisted into a composite yarn.

When the fineness is large, the product has a large fiber diameter and is thick, so it is particularly difficult to make a product that feels cool. However, for example, when the fineness is greater than 31 dtex, the fiber height k is preferably 75 μm to 220 μm, more preferably 75 μm to 150 μm by adjusting the draft rate (yarn length ratio between the elastic yarn and the inelastic fiber constituting the composite yarn) and the number of twists, which will be described later. By doing so, the pitch rib height ratio (p / k) can be adjusted to 6.0 to 9.0.

In the tubular knitted fabric product of the present embodiment, the fiber diameter of the composite yarn can be adjusted by adjusting the draft rate (the yarn length ratio of the elastic yarn and the inelastic fiber constituting the composite yarn). The draft rate is the value of the ratio of the length of the elastic yarn to the length of the inelastic fiber (length of elastic yarn/length of inelastic fiber) when a conjugate yarn of a certain length is divided into elastic yarn and inelastic fiber and unwound, and the length is measured by applying a load of 10 g to each. Specifically, the smaller the draft rate, the smaller the fiber diameter, and the larger the yarn length ratio, the larger the fiber diameter. From the viewpoint of adjusting the pitch rib height ratio and the composite yarn elongation index to suitable ranges, the yarn length ratio of the composite yarn is preferably 2.0 to 3.5.

The fiber diameter can also be adjusted by adjusting the number of twists of the composite yarn. If the number of twists is high, the fiber diameter will be small, and if the number of twists is low, the fiber diameter will be large. From the viewpoint of adjusting the pitch rib height ratio and the elongation index of the composite yarn within a suitable range, the twist number of the composite yarn is preferably 1400 to 2000 T/m.

The number of wales in the circumferential direction of the tubular knitted fabric product of the present embodiment can be arbitrarily set depending on the size of the product and the like, but is preferably 320 to 440 wales. When the tubular knitted fabric product of the present embodiment does not include a sewn portion in the longitudinal direction of the leg portion or the arm portion, that is, when it is made of a seamless tubular knitted fabric, the number of wales in the circumferential direction can be adjusted by the number of needles of the knitting machine used when knitting the tubular knitted fabric.
In order to keep the pitch rib height ratio and the composite yarn elongation index within suitable ranges, it is preferable that the wale density at the time of elongation assumed to be worn is 15 to 30 wales/inch (2.54 cm). From the same point of view, the course density when stretched assuming wearing is preferably 23 to 70 courses/inch, more preferably 29 to 70 courses/inch (2.54 cm). When the wale density is 15 wales/inch or more, the heat retention rate tends to be negative, the heat dissipation effect is likely to be obtained, the bursting strength is high, the tear resistance is high, and the aesthetic appearance tends to be improved. On the other hand, when the wale density is 30 wales/inch or less, the heat retention rate tends to be negative, and the heat dissipation tends to be high.

In order to bring the pitch rib height ratio and the composite yarn elongation index into the desired ranges, it is effective to adjust the loop length during knitting. If the tension during knitting is increased or the stitches are narrowed, the loop length becomes shorter, the fineness becomes smaller when stretched assuming wear, and the number of courses becomes larger when stretched assuming wear. This slightly increases the pitch rib height ratio. Conversely, if the tension is lowered or the mesh is made softer, the loop length becomes longer, the fineness when stretched assuming wear increases, and the number of courses when stretched assuming wear becomes smaller. This slightly reduces the pitch rib height ratio.

In a tubular knitted fabric product, if the product itself generates little heat due to the elongation of the elastic yarn, the product tends to be cool when worn. It is impossible to set the exothermic temperature during elongation (heat exothermic temperature during elongation) to 0°C, but if the exothermic temperature during elongation is preferably above 0°C and 0.5°C or less, more preferably above 0°C and 0.4°C or less, it is easy to feel cool even in a hot environment. In this specification, the exothermic temperature during elongation is defined as the maximum temperature exhibited by the knitted fabric during 500 repetitions of repeated stretching at a rate of 100 times/min. It is a value calculated from the difference from the knitted fabric temperature. In order to keep the exothermic temperature during elongation at 0.5°C or less, it is effective to use a slippery processing agent such as a silicon-based or polyamide-based processing agent, reduce the fineness of the composite yarn, and use a composite yarn of a polyamide-based synthetic fiber and an elastic yarn. The reason why the use of composite yarn of polyamide synthetic fiber and elastic yarn lowers the heat generation temperature during elongation is thought to be that the hygroscopicity of polyamide fibers suppresses heat generation during elongation.

In the tubular knitted fabric product of the present embodiment, the leg portion and the arm portion are composed of composite yarns composed of elastic yarns and inelastic fibers. The composite yarn may be a covering yarn of single covering yarn (SCY) or double covering yarn (DCY) obtained by winding inelastic fibers around an elastic yarn, or a twisted yarn.

The knitting structure of the tubular knitted fabric product of the present embodiment is not particularly limited, but all courses are preferably knitted in a jersey structure using composite yarns made of elastic yarns and inelastic yarns, for example, covered elastic yarns (covering yarns) and composite twisted yarns. For the purpose of reinforcement or the like, it is also possible to knit separately prepared fibers or to mix a knit structure with a tuck structure or a welt structure from the ankle to the toe.

In the jersey weave knitted by the mixed knitted structure of the composite yarn and the inelastic yarn, if the composite yarn and the inelastic yarn have significantly different fineness and different fiber heights, it is effective to alternately change the fiber spacing so that the pitch rib height is suitable for improving heat dissipation. When the fiber height of the composite yarn is _k1 and the fiber height of the inelastic fiber is _k2 , the fiber spacing _p1 formed by the needle loop of the composite yarn and the sinker loop of the inelastic yarn is 6.0 to 15.0 times _k1 , and the fiber spacing _p2 formed by the needle loop of the inelastic yarn and the sinker loop of the composite yarn is 6.0 to 15.0 times _k2 .

The elastic yarn used in the tubular knitted fabric product of the present embodiment may be a polyurethane-based or polyetherester-based elastic yarn. For example, the polyurethane-based elastic yarn may be dry-spun or melt-spun, and the polymer and spinning method are not particularly limited. It is preferable that the elastic yarn has a breaking elongation of about 400% to 1000%, is excellent in stretchability, and does not lose its stretchability at around 180° C., which is the normal processing temperature in the preset process during dyeing. As the elastic yarn, it is also possible to use an elastic yarn imparted with functionality such as high setting properties, antibacterial properties, moisture absorption, and water absorption by adding a special polymer or powder. The fineness of the elastic yarn is 13 to 44 dtex, preferably non-elastic yarn of 13 to 22 dtex is suitable.

Furthermore, the tubular knitted fabric product of the present embodiment can contain an inorganic substance in the elastic yarn, and can be a knitted fabric that takes into consideration the performance of the contained inorganic substance. For example, if titanium oxide is contained, a knitted fabric with excellent heat conductivity and heat dissipation can be obtained. As a method of including the inorganic substance, a method of adding the inorganic substance to the spinning stock solution of the elastic yarn and spinning the elastic yarn is simple. In this specification, the inorganic substance refers to a ceramic inorganic substance such as titanium oxide and/or an inorganic compound. These inorganic substances are preferably contained in the elastic yarn in an amount of 1 to 10% by weight. If the amount of the inorganic substance is too small, the cooling effect is small, and if the amount is too large, the yarn may break during spinning or stretching.

As inelastic fibers, polyester fibers such as polyethylene terephthalate and polytrimethylene terephthalate, polyamide fibers, and polyolefin fibers such as polypropylene can be used, but polyamide synthetic fibers are preferred. In addition, these bright yarns, semi-dull yarns, full-dull yarns, etc. can be arbitrarily used, and the cross-sectional shape of the fiber can be round, elliptical, W-shaped, cocoon-shaped, hollow fiber, or any other cross-sectional shape. The shape of the fiber is not particularly limited, and raw yarn, crimped yarn such as false twist can be used, but it is preferable to use raw yarn that is excellent in cold sensation and moisture absorption. Inelastic yarns having a fineness of 5 to 25 dtex, preferably 8 to 15 dtex, are suitable for use.

Inelastic fibers can contain 0.3 to 5% by weight of inorganic substances such as titanium oxide and agents with excellent moisture absorption.

As a method for dyeing and finishing the tubular knitted fabric product of the present embodiment, a normal dyeing and finishing process can be used, and the dyeing conditions are set according to the fiber material used, and the dyeing machine to be used is arbitrary, such as a paddle dyeing machine or a drum dyeing machine. A processing agent that improves water absorption and flexibility, and a processing agent that enhances cold feeling can be used.

EXAMPLES The present invention will be specifically described below with reference to examples, but the present invention is not limited only to these examples. The evaluation methods used in the examples were as follows.

(1) Pitch rib height ratio A tubular knitted fabric was placed on a desk in an unstretched state, the total length was measured, and lines were drawn at 13% and 26% of the total length from the center side of the body when the product was worn. In the case of leg products, the tubular knitted fabric is the length from the crotch at the base of both legs to the toe in the case of tubular knitted fabric with toes, and in the case of leggings without toes, the length to the end of the leg around the ankle is measured in an unstretched state. In the case of the arm cover, the length from the armpit side end to the wrist side end was placed on the desk in an unstretched state and the total length (5 in FIGS. 4 and 5) was measured, and the length from the armpit side end 13% and 26%. A cylinder with a diameter of 14 cm, a circumference of 44 cm, and a length of 30 cm was covered with a tubular knitted fabric from the center side of the body when the product was worn, and the line of 26% of the total length from the center side of the body was stretched so that the length of the cylinder was 30 cm. A paper circular frame plate having a diameter of 8 cm and a frame width of 8 mm was superimposed on the tubular knitted fabric so that the 13% line of the total length was in the center, and the frame plate was fixed to the tubular knitted fabric with an instant adhesive. The fabric on the outside of the frame plate was cut and samples were taken in the stretched state assumed to be worn. This was used for evaluation in an extended state assuming wearing.
The fiber diameter of the sampled fabric was measured with a microscope VHX-6000 (manufactured by Keyence Corporation). Measurements were taken at any 5 locations within the screen, and the average was rounded off to the nearest whole number to obtain the fiber height k. When the composite yarn is a covered yarn, the fiber diameter is large in the portion covered with the composite yarn, and the fiber diameter appears small in the portion where the core yarn is exposed, but when evaluating the rib height, the fiber diameter of the covered portion was used as the measured value. As for the fiber spacing, arbitrarily selected five loops were used as the vertical fiber spacing p _v and the horizontal fiber spacing _ph , and the average value was taken as the fiber spacing. The average value of the fiber spacing measured in five loops was rounded off to the nearest whole number to obtain the fiber spacing p.

(2) Composite yarn elongation index Composite yarn was pulled out from the leg portion or arm portion of the tubular knitted fabric product, weighed, and then measured with a load of 10 g applied to determine the fineness. Sampling was performed at three or more locations, and the fineness was obtained by rounding off to the nearest whole number and designated as f. Using the k obtained in (1) above, the following formula:
Composite yarn elongation index = k/f
{In the formula, k = fiber height when stretched assuming wear, f = fineness of composite yarn. }
The composite yarn elongation index obtained by was calculated and rounded off to the second decimal place to obtain the composite yarn elongation index.

(3) Thermal insulation rate (heat dissipation)
The heat retention rate was measured using a self-made heat dissipation evaluation machine. The heat radiation evaluation machine consists of a cylinder with a diameter of 14 cm, a circumference of 44 cm, and a length of 30 cm, and has a heater and a temperature sensor inside. A control circuit is built to keep the temperature inside the cylinder at 37°C. When the temperature inside the cylinder is lower than 37°C, power is supplied to the heater to raise the temperature. The power consumption W was measured when the heat dissipation evaluation machine was operated in an environment of 20° C. and 65% RH for 1 hour.
The tubular knitted fabric was placed on a desk in an unstretched state, the total length was measured, and a line was drawn at 26% of the total length from the center side of the body when the product was worn (3 in FIG. 1, 7 in FIG. 4). After conditioning the humidity for 24 hours in an environment of 20° C. and 65% RH, the sample was placed on a heat dissipation evaluation device, and the heat dissipation amount was measured by stretching the line of 26% of the total length from the center side of the body so that the length of the cylinder was 30 cm. The power consumption _W0 was measured in advance with no sample attached, and the power consumption W with the sample attached was measured. From these measurements the following formula:
Heat retention rate = (W ₀ - W) / W ₀ × 100 (%)
The heat retention rate was obtained by

(4) Exothermic temperature during elongation At the position of 50% of the total length of the tubular knitted fabric product (the length of 4 in FIG. 1 and 8 in FIG. 4), the length is 100 mm (excluding the grip part) and the width is the tubular knitted fabric. The measurement environment was a constant temperature and humidity condition of 20° C. and 65% RH, and the measurement was performed in a state in which no energy was supplied from the outside except for expansion and contraction. Stretching conditions were set such that the elongation rate was 110% of the initial length (since the initial length was 100 mm, the gap between the gripping portions was expanded to 210 mm by stretching), and the stretching was repeated at a speed of 100 times/min. During 500 repetitions of elongation and after the end of elongation, the surface temperature of the sample was continuously measured by thermography. At this time, the emissivity of the thermography was set to 1.0. The temperature when the surface of the sample to be measured reached the maximum temperature was read, and the temperature increased compared to the temperature before stretching was taken as the exothermic temperature during stretching.

(5) Course Density and Wale Density when Stretched assumed to be worn For the fabric sampled in (1) above, the number of courses per inch length was measured. Three or more points were sampled in the circumferential direction and the number of courses was measured.
The number of wales between 1-inch lengths of the same sample was similarly measured.

(6) Temperature of heat generated by wearing The manufactured tubular knitted fabric product was worn in an environment of 30°C and 50% RH, and a treadmill was used to walk at 5 km/Hr for 3 minutes. In the case of leg products such as pantyhose and leggings, the leg surface temperature from the thigh to the ankle, in the case of leg products such as gaiters and supporters, the leg surface temperature covered by the tubular knitted fabric, in the case of clothing such as arm covers that cover at least part of the arm, the arm surface temperature covered by the tubular knitted fabric is observed by thermography, the average temperature before and after walking is obtained by image analysis, and the change from the average temperature of the entire leg before walking is calculated using the following formula:
Wearing fever temperature = (temperature of leg or arm before walking) - (temperature of leg or arm after walking)
obtained by A lower wear heat generation temperature indicates a cooler tubular knitted fabric product even in a hot environment.

(7) Feeling of wearing The manufactured tubular knitted fabric product was worn in an environment of 30°C and 50% RH, and the wearer walked on a treadmill at 5 km/hr for 3 minutes.

[Example 1]
A covered elastic yarn of 28 dtex was obtained by covering an elastic yarn of 44 dtex (trade name Roica BZ, manufactured by Asahi Kasei Co., Ltd.) with a 13 dtex/7 filament of polyamide fiber at a draft rate of 3.0 and a twist number of 2000 T/m. Using this covered elastic yarn, a pantyhose knitting machine with 352 needles was used to knit pantyhose from the waist portion to the toe. Here, the part corresponding to the panty part was knitted alternately with the covered elastic yarn and the 78 dtex/24 filament polyamide fiber textured yarn, and from the crotch to the toe part, the loop size was gradually reduced only with the covered elastic yarn. The knitted fabric was covered with a metal set mold and preset at 80° C. using a steam set machine. After that, the knitted fabric was turned inside out, and the crotch portions of the two leg knitted fabrics were sewn together to form a pair of pantyhose. Furthermore, the toe part was sewn with a talker, turned inside out again, and put into the paddle dyeing machine. Polyamide fibers were dyed, and at the end of the dyeing process, a silicon-based processing agent (SFC Silicon Nu62 (manufactured by Meisei Chemical Industry Co., Ltd.)) was put into a 5% owf paddle dyeing machine and treated at room temperature for 5 minutes. After 5 minutes, the pantyhose was removed from the paddle dyeing machine, dehydrated and dried, set in a leg-shaped metal frame, and set at 115° C. for 20 seconds to obtain pantyhose having 352 wales in the circumferential direction. The number of course wales, pitch rib height ratio, composite yarn elongation index, heat generation temperature during elongation, and heat retention rate of the produced pantyhose were measured. As a result of verifying the temperature of heat generated by wearing and the feeling of wearing by wearing test, it was found that it was cool to wear. The results are shown in Table 1 below.

[Example 2]
Leggings with 320 wales in the circumferential direction were manufactured using a pantyhose knitting machine with 320 needles and the other manufacturing conditions being the same as in Example 1. The results are shown in Table 1 below.

[Example 3]
A covered elastic yarn of 24 dtex was obtained by covering an elastic yarn of 33 dtex (trade name Roica SF, manufactured by Asahi Kasei Co., Ltd.) with a 13 dtex/7 filament of polyamide fiber at a draft rate of 3.0 and a twist number of 1600 T/m. Using this covered elastic yarn, a pantyhose knitting machine with 400 needles was used to knit pantyhose from the waist portion to the toe. Under the following conditions, the same pantyhose as in Example 1 was manufactured. The results are shown in Table 1 below.

[Example 4]
In Example 3, a pantyhose knitting machine with 352 needles was used, and pantyhose with 352 wales in the circumferential direction were manufactured under the same manufacturing conditions. The results are shown in Table 1 below.

[Example 5]
In Example 3, a pantyhose knitting machine with 320 needles was used, and pantyhose with 320 wales in the circumferential direction were manufactured under the same manufacturing conditions. The results are shown in Table 1 below.

[Example 6]
A covered elastic yarn of 28 dtex was obtained by covering an elastic yarn of 44 dtex (trade name Roica BZ, manufactured by Asahi Kasei Co., Ltd.) with a 13 dtex/7 filament of polyamide fiber at a draft rate of 3.0 and a twist number of 1800 T/m. Using this coated elastic yarn and raw yarn of 18 dtex/3 filaments of polyamide fiber, a pantyhose knitting machine with 352 needles was used to knit the pantyhose from the waist portion to the tip of the toe. Here, the portion corresponding to the panty portion was knitted alternately with the covered elastic yarn and the 78 dtex/24 filament polyamide fiber processed yarn, and from the crotch, the covered elastic yarn and the 18 dtex/3 filament polyamide fiber raw yarn were alternately knitted to the toe portion while gradually reducing the loop size. The knitted fabric was covered with a metal set mold and preset at 80° C. using a steam set machine. After that, the knitted fabric was turned inside out, and the crotch portions of the two leg knitted fabrics were sewn together to form a pair of pantyhose. Furthermore, the toe part was sewn with a talker, turned inside out again, and put into the paddle dyeing machine. The polyamide fiber was dyed, and at the end of the dyeing process, a silicon-based processing agent (Softex HS-450 (manufactured by Kitahiro Chemical Co., Ltd.)) was put into a 3% owf paddle dyeing machine and treated at room temperature for 5 minutes. After 5 minutes, the pantyhose was removed from the paddle dyeing machine, dehydrated and dried, set in a leg-shaped metal frame, and set at 115° C. for 20 seconds to obtain pantyhose having 352 wales in the circumferential direction. The results are shown in Table 1 below.

[Example 7]
In Example 6, an elastic yarn of 44 dtex (trade name: Roica BZ, manufactured by Asahi Kasei Corporation) was double-covered with 11 dtex/7 filaments of polyamide fiber at a draft rate of 3.0 and a twist number of 1400 T/m to obtain a covered elastic yarn of 37 dtex. Using this coated elastic yarn and raw yarn of 18 dtex/3 filaments of polyamide fiber, a pantyhose knitting machine with 352 needles was used to knit the pantyhose from the waist portion to the tip of the toe. The results are shown in Table 1 below.

[Example 8]
In Example 4, a pantyhose knitting machine with 352 needles was used to produce an arm cover with 352 wales in the circumferential direction. From the upper arm to the forearm, the toe portion was knitted only with the covered elastic yarn while gradually decreasing the size of the loop. At both ends of the fabric, a rib structure was knitted with two yarns of polyester fiber textured yarn 56/24 and coated elastic yarn. The tubular knitted fabric was placed over a metal set mold and preset at 80° C. using a steam set machine. The results are shown in Table 1 below. The polyamide fiber was dyed, and at the end of the dyeing process, a polyamide-based processing agent (Softex NF-10 (manufactured by Kitahiro Chemical Co., Ltd.)) was put into a 3% owf paddle dyeing machine and treated at room temperature for 5 minutes. After 5 minutes, it was removed from the paddle dyeing machine, dehydrated and dried, then set in an arm frame and set at 115° C. for 20 seconds to obtain an arm cover with 352 wales in the circumferential direction. The results are shown in Table 1 below.

[Example 9]
A 22 dtex elastic yarn (trade name: Roica SF, manufactured by Asahi Kasei Corp.) was covered with a 13 dtex/7 filament of polyamide fiber at a draft rate of 2.5 and a twist number of 1800 T/m to obtain a covered elastic yarn of 22 dtex. Using this covered elastic yarn, a pantyhose knitting machine with 352 needles was used to knit pantyhose from the waist portion to the toe. Under the following conditions, the same pantyhose as in Example 1 was manufactured. The results are shown in Table 1 below.

[Example 10]
A 19 dtex elastic yarn (trade name Roica BZ, manufactured by Asahi Kasei Co., Ltd.) was covered with 11 dtex/7 filaments of polyamide fiber at a draft rate of 2.4 and a twist number of 1800 T/m to obtain a covered elastic yarn of 19 dtex. Using this covered elastic yarn, a pantyhose knitting machine with 352 needles was used to knit pantyhose from the waist portion to the toe. Under the following conditions, the same pantyhose as in Example 1 was manufactured. The results are shown in Table 1 below.

[Example 11]
In Example 1, the pantyhose was manufactured with a large loop length during knitting. The results are shown in Table 1 below.

[Example 12]
In Example 1, at the end of the dyeing process, a urethane-based finishing agent (Pascol v-221 (manufactured by Meisei Chemical Industry Co., Ltd.)) was put into a 3% owf paddle dyeing machine and treated at room temperature for 5 minutes to produce pantyhose. The results are shown in Table 1 below.

[Comparative Example 1]
In Example 1, a pantyhose knitting machine with 432 needles was used, and leggings with 432 wales in the circumferential direction were manufactured under the same manufacturing conditions. The results are shown in Table 1 below.

[Comparative Example 2]
In Example 10, the pantyhose was manufactured by setting the loop length at the time of knitting to be considerably large. The results are shown in Table 1 below. The pantyhose was torn during the operation of putting on the sample for the wearing test, and the burst strength was measured to be 40 hPa. In addition, unevenness in wearing was conspicuous, and there was also a problem with aesthetics.

[Comparative Example 3]
A commercially available pantyhose with a composite yarn fineness of 37 dtex was purchased, and various physical properties were measured. The results are shown in Table 1 below.

Since the tubular knitted fabric of the present invention is a cool tubular knitted fabric in a hot environment, it can be suitably used for various clothing products, for example, leg products such as pantyhose and leggings that cover from the crotch to the ankle or toes, leg products that cover all or part of the lower legs such as supporters and gaiters, products that cover from under the shoulder to the wrists or fingertips such as arm covers, and products that cover joints such as supporters.

1 Leg length of the leg product 2 Position 13% from the center of the body when the leg product is worn 3 Position 26% from the center of the body when the leg product is worn 4 Length of 50% from the center of the body when the leg product is worn 5 Total length of the garment that covers at least part of the arm 6 Position of 13% from the center of the body when the garment that covers at least part of the arm is worn 7 Body center side when the garment that covers at least part of the arm is worn 26% from 8 50% of the length from the center of the body when wearing a clothing product that covers at least part of the arm

Claims (5)

A tubular knitted fabric product containing composite yarns made of elastic yarns and inelastic yarns, at a position of 13% of the total length from the center side of the body when the product is worn,
Pitch rib height ratio = p/k
{In the formula, p = fiber spacing when assumed to be worn and stretched, k = fiber height when assumed to be worn and stretched}
The tubular knitted fabric product, wherein the pitch rib height ratio obtained in is 6.0 to 15.0. From the center side of the body when wearing the product, at the position of 13% of the total length, the following formula:
Composite yarn elongation index = k/f
{In the formula, k = fiber height when stretched assuming wear, f = fineness of composite yarn}
2. The tubular knitted fabric product according to claim 1, wherein the composite yarn elongation index determined by is 4.0 or less. 3. The tubular knitted fabric product according to claim 1 or 2, wherein the heat generation temperature during elongation is higher than 0°C and not higher than 0.5°C. The tubular knitted fabric product according to any one of claims 1 to 3, which is a leg product. The tubular knitted fabric product according to any one of claims 1 to 3, which is a garment covering at least part of the arm.

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